Auto Powerfold S-Type

So having spent today getting my head around and studying the theoretical wiring diagram and module schematics for auto powerfold mirrors on double lock/unlock (thanks Paul for supplying)I had an idea, I had to try and figure how it would interface with the wiring into my car as it is older than the model this module and diagram are designed for (mine is pre 2004) and suddenly thought I could alter the module a little, instead of having the powerfold work on double lock and unlock, why not configure it to open with ignition accessory and close when ignition is off. Then I thought a little further and realised my drivers seat powers up and goes to its memory position every time I place the key in the ignition, and returns when I remove it. So why cant I use a pulse from this to fire the relay/s to operate the mirrors folding function? not as flashy as remote lock and mirrors combined but a little more subtle and straight forward I think. Anyone have any thoughts or reasons why my theory maybe wrong?